A new study provides a twist in the mystery source of our planet's water and the search for extraterrestrial life forms.
Illustration showing an object carrying water to Earth in the boundary between the inner and outer solar system, with the asteroid belt in between Mars and Jupiter.Water is crucial to sustaining our lives and the planet we inhabit. In fact, around 71% of the Earth’s surface is covered by water.
The study involved looking at samples from 7 meteorites, originating from either the inner and outer reaches of the solar system, that eventually slammed into Earth. This likely happened billions of years after they split off from at least five so-called— objects which collided with others to form our solar system’s planets.
Interesting Engineering: If water came to Earth on unmelted meteorites, how did they avoid the fate of the achondrite meteorites and not melt upon impact?Great question. Achondrite meteorites are thought to have melted in response to heating by radioactive decay during the first few million years of solar system history. Radioactive heating was very intense during the first couple of million years of solar system formation, because there was a lot of 26Al, which is a short-lived radionuclide.
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